Upgrading 4.3.3 to 4.4.2

Hi, I downloaded the 4.4.2 version JoomShopping-(. Zip) and now I want to upgrade from version 4.3.3 that I have installed. I have accessed Components / JoomShopping / Install & Updates, I select JoomShopping-4.4.2.zip file I've downloaded and pulse 'upload'. Soon tells me the update has been successful, yet if I click on the option to 'About Us', I keep getting version 4.3.3.